The mind within the senses does not dwell, It has no place in outer things, like form, And in between, the mind does not abide;
Not out, not in, not elsewhere can the mind be found.
Something not within the body, and yet nowhere else, That does not merge with it nor stand apart—
Something such as this does not exist, not even slightly. Beings have nirvana in their nature.
Shantideva, The Way of the Bodhisattva (Bodhicharyavatara), Chapter 9 verse 102--103, Shambala Publications ISBN 1-57062-253-1.